This is Pokemon Tretta Lab for Nintendo 3DS. The app is a free download, but the hardware costs 3,800 yen (around $38).

In Japan, there are coin-operated Pokemon games that use chipped plastic pucks. Players put the pucks on a mat on the machine, and the mat "reads" the pucks. So, for example, if you put down a Pikachu puck, then Pikachu appears on the screen. If you move the Pikachu puck around on the mat, then it moves around on the screen. Then, the Pocket Monsters fight.

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The Pokemon Tretta Lab allows kids to "study" the pucks they have as well as the ones they don't have. There are also various battle modes.

Seems like a pricey add-on, but kids also get three original Tretta pucks. And at around the four-minute mark you can see just how big the contraption is. It's pretty big.